There are 2 of those. Yes, it is a nylon grade slide and they are on each bottom corner and the bottom corners glide on those glides. If you send a pic to Tiffin with your year/Model Phaeton, they will be able to sell you both glides. It comes with those glides and ther metal square block they mount into. They may send them to you free. You MUST lift the room up about 3/4 inch(yes it will raise that much with the correct lift) to install those glides. They are installed from the outside and if you pull the bottom wipe seal down on the other corner you will see the other one and where it goes. Doug